[PraveenNesamani]

Fixes #4752

The "Build Status" badge in the README pointed to the old workflows/Node.JS%20CI/badge.svg URL, which now returns 404 because that workflow no longer exists.

This updates both the badge image and its link to the current pr.yml workflow:

• image: https://github.com/graphql/graphiql/actions/workflows/pr.yml/badge.svg
• link: https://github.com/graphql/graphiql/actions/workflows/pr.yml

Only the README is changed.

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Latest commit: 6f24238

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[linux-foundation-easycla]

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